Vacuum pump rotor



FIG. 1 is a top plan view of a vacuum pump rotor showing my new design;

FIG. 2 is a front view thereof (rear view is the same as the front view);

FIG. 3 is a right side view thereof (left side view is the same as the right side view);

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a cross-sectional view taken along the line 5—5 of FIG. 2. 

The ornamental design for a vacuum pump rotor, as shown and described. 